Pre-cleaning should include the removal of metal filings and weld splatter: both are potential sources for dirt in phosphate and electrocoat.
预清洗系统包括清除金属屑及焊渣， 它们是磷化和电泳槽内的污染物的来源。
2
Cleaning new part sanding priming and if necessary pre-painting inner surfaces seams and edges that will no longer be accessible or insufficiently so after installation of the part.
This paper describes mechanical cleaning in place of chemical cleaning to clean the scale in vacuum salt making pre-heater with good results in practical application.